Alkali-proof dye and method of producing the same



.Methyl 'violet he s. e. ts: its a LELAND C. GATES, 0F CHIOAGG, ILLINQIS, ASSIGNUR TO SUNBEAM'GHEMICAL COIVHFANY, (BF CHECAQQ, ILLINOIQ. A CQRIPOBATION O15 ILLINOIS.

ALKALL-PRGOF DYE AND METHOD 13L? PRODUCING THE SAME.

No Brewing.

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because of the fact that such dyes are not alkali proof. They cannot be employed in many commercial lines and no practical method is known to the trade whereby such dyes may be transformed and made of value "for general use. Recognizing this short-coining and desiring to increase the field. ofusefulness of American dyes,'1 have devised a method whereby many of the dyes, the usefulness oil which has heretofore been limited, may be transformed into a valuable commercial product at a very low cost.

Not only are the dyes alkali proof and cepeble of beiiig used for dyeing fabrics, etc, but the dye produced in accordance with my method is stable in form, even more stable than in its original condition.

I am able to say from experiments and practice that the following dyes may be treated in the manner hereinafter described in order to transform the some itIlCl render them alkali proof. The names given are in many instances the trade names because I have not at this time been able to ascertain the technical. names or the structural formule of the dyes.

Tertrezum Green M. Phe11o-black,$. Gr. N. Elcarlet 7.

Blue R. Nephthol green B. Azo rubin S. Acid yellow H. M. Scarlet 2 R. B. Crystgil violet 6 B. N.

Scarlet 4 R. N.

(lid orange Fast acid red marden Bismarck brown T. D. ltesorcin brown Auremin Poncean 2 B.

Congo red Bordeaux B. N.

Acid black 10 B. N. Anilin red Acid brown 1530 Nigrcsin T.

In the treating of dyes and rendering the Specification 01: Letters Patent.

Application filed July .27,

Fetented ring, it list Elf.

leis. Serial No. zeeess.

some alkali proof, I prefer to proceed in accordance with the following method. 1 dissolve substantially ten pounds of one ot the above mentioned dyes in ziprufoxinmtoly thirty pints, one quarter normal(lflflcmrstic alkali, that is it very Weak sodium hydroxid or is heated preferably being brought to hoil, whereupon I add to the mixture approximately twenty gallons of a suitable vegetable oil. 5 If desired 1 may dilute the vegetable oil with high as 29% of en oleeginous mineral substance such as Vaseline of a good quality. The dyes, caustic alkali and oil. are combined in a mixer, agitated, ssponi ficetion continuing until the caustic is exhausted. I then odd e quantity of 40 degree Bauni caustic soda solution, which quantity may be seven gallons more or less.sufi"1- cient to sapon fy the unsspohified oil in the compound. The amount of caustic thus added will vary and can be determined in each instance only by computstionor experiment. it Will vary with different dyes, some of which? require more and some less alkali. It will also vary with the quantity and character of the oils.

After seponificetion of the final compound is complete, all of which is permitted to take place Without the addition or" further heat, the mixture is allowed to harden and after substantially complete drying and hardening, it is crushed and coinniinuted. In this condition it is stable and may he employed in the same manner as the imported alkali proof dyes, the production of which was thought possible only in Germany.

The proportions mentioned ar illustrative only and in: y he varied Within rather 'Wide limits as experiments will prove.

Therefore the, proportions mentioned in the appended claims should be considered as illustrations and suggestions and not as specific limitations.

I claim:

1. Elie'method of treating dyes, which consists'in,dissolving the dyein a. Wes-l; solution of ellzsli, then applying heat, then adding the mixture to oil and permitting; saponiiicetion to continue until the alkali is substantially exhausted, then adding substantially the exact quantity of elhali required to ssponify shy nnseponified oil,

.iilar emetic solution." This mixture consists in dissolving the dyc in a solution then permitting the compound to harden, then comminuting the same substantially as described 2. The method of treating dyes which of substantially one-quarter normal aliiz'ili then applying heat, then adding the mixture to oil'and permitting saponification secontinue until the alkali is substantially ex -hausted thc11- adding substantially the exact quantity of alkali required to saponify any unsaponifie'd oil, then permitting the com-- pound to harden, then *comminuting the same, substantially as described.

The method of' producing alkali proof dyes, which. consists in. dissolving a nonalkali proof dye in a suhsiantially one-- quarter normal solution of sodium hydro-Kid, bringing the solution to substantially the boiling-point, then adding an excess of a saponifiahle oil, permitting the subsequent 1eact-ion so continue until the alkali is substantial y exhausted, than Mi ling alkali in the pro? quantity to saponify the oaccss oil, then permitting she substance to hamen, then po'wdering the same suostanlially as described.

a. The method of treating dies, which consists in dissolving substantially ton masses pounds of a non-alkali proof dye in substantially thn'ty pints of approximately 1% solution, sod11.m1hydrox1d, then applying heat, then addingsubstantially twenty galions of an 01L then agltatlng and permitting saponilication, to continue until, the alkali exhausted then addin 'such ouantit of 7 b l a non-alkali proof dye, eak, alkali solo:-

lion and a saponificd oil, substantially as described.

6. An alkali proof dye in comminuted form, composed, of the reaction products of a non-alkali proof dye, a Weak, alkali solution, and saponified oil, the dye first being treated in an excess of oil and the excess of oil being later saponificd, substantially as described.

Signed at Chicago, in the county of Cook and. State oi Illinois, this day of Julyi i918.

LELAND C. GATES.

*Witness 2 

